如何删除atk4中的子记录？

Question

看来ModelDeleteDelete挂钩在层次结构上不起作用。 让我举例说明。

class Model_User extends Model_Table{
    public $table='user';
    function init(){
        parent::init();
        $this->debug();
        $this->addField('name');
        $this->hasMany('Item');
        $this->addHook('beforeDelete',$this);
    }
    function beforeDelete($m){
        $m->ref('Item')->deleteAll();
    }
}

class Model_Item extends Model_Table{
    public $table='item';
    function init(){
        parent::init();
        $this->debug();
        $this->addField('name');
        $this->hasOne('User');
        $this->hasMany('Details');
        $this->addHook('beforeDelete',$this);
    }
    function beforeDelete($m){
        $m->ref('Details')->deleteAll();
    }
}

class Model_Details extends Model_Table{
    public $table='details';
    function init(){
        parent::init();
        $this->debug();
        $this->addField('name');
        $this->hasOne('Item');
    }
}

当我在“祖父母” Model_User上调用delete（）时，它将尝试按预期删除所有Item记录，但是从那里不执行Item.beforeDelete挂钩，并且在尝试删除Item之前不要删除Details记录。

我做错了什么？

Answer 1

我想至少在分层模型结构中它有效。

这是这样做的：

class Model_Object extends hierarchy\Model_Hierarchy {
    public $table = 'object';

    function init(){
        parent::init();
        $this->debug(); // for debugging
        $this->addField('name');
        $this->addHook('beforeDelete',$this);
    }

    function beforeDelete($m) {
        // === This is how you can throw exception if there is at least one child record ===
        // if($m->ref('Object')->count()->getOne()) throw $this->exception('Have child records!');

        // === This is how you can delete child records, but use this only if you're sure that there are no child/child records ===
        // $m->ref('Object')->deleteAll();

        // === This is how you can delete all child records including child/child records (hierarcialy) ===
        // Should use loop if we're not sure if there will be child/child records
        // We have to use newInstance, otherwise we travel away from $m and can't "get back to parent" when needed
        $c = $m->newInstance()->load($m->id)->ref('Object');
        // maybe $c = $m->newInstance()->loadBy('parent_id',$m->id); will work too?
        foreach($c as $junk){
            $c->delete();
        }
        return $this;
    }

}

重要的事情是：
*扩展层次结构\\ Model_Hierarchy类而不是Model_Table
*在beforeDelete挂钩中使用适当的方法
* *如果我们有孩子则限制删除-抛出异常
* * deleteAll-当您确定没有子记录时使用它
* * newInstance +循环+删除-在必须删除记录（甚至子级/子级...）时使用它

也许有些人有更好的解决方案？